Major GPA

I hear all the time on here about "major GPA" and how it's just as or more important as cumulative GPA. I'm kind of confused though what people mean by it - cumulative GPA is easy since you count all classes you've taken in college. But major GPA could be:

1. Only classes in your major department (say, for me, EE)
2. Only non-GE classes required for the major (including, say, calc 3, but not including the EE elective that counted only for unit credit)
3. a combo of 1 and 2 (all classes in your home department plus all outside non-GE requirements like math and physics)
4. All "technical" classes (all math, physics, and engineering courses taken, regardless of if they're required or not)
5. Something entirely different?!?!?!

I would think it would be 4 (or possibly 3) but I just have no clue. My university doesn't define "major GPA" (they do define "department GPA", we have to make a 2.0 both in all classes as well as all classes in the home department)